Save 70 calories and 8 grams of fat per serving by preparing with KRAFT Light Mayo Reduced Fat Mayonnaise and KRAFT 2% Milk Shredded Cheddar Cheese, and substituting 1-1/2 cups cholesterol-free egg product for the 6 eggs.

Cover unbaked casserole tightly with plastic wrap; freeze until solid. Cover with foil. Freeze up to 3 months. When ready to serve, heat oven to 350ºF. Remove foil and plastic wrap. Discard plastic wrap. Re-cover casserole with foil. Bake 1 hour. Remove foil; sprinkle casserole with cheese. Bake, uncovered, 15 min. or until center is set and cheese is melted. Let stand 10 min. before serving. To decrease the baking time, thaw casserole in refrigerator overnight, then bake, uncovered, 40 min. or until center is set and cheese is melted.

Sprinkle egg mixture with cooked and crumbled OSCAR MAYER Bacon along with the mushrooms, tomatoes and onions.